opcache_get_status
This will return that holds information about whether the opcache is turned on or not, whether it’s in a restart phase, the memory usage and hit statistics, and any files that have been cached along with hit and memory details. For example:

GUI

APC did have a GUI which was quite handy to see what had been cached, settings and memory usage but Zend OPcache doesn’t (currently as far as I could see) have anything similar.

It is possible to get information from looking at the output of phpinfo() which contains all of the key information.

However, I’ve just pushed the start of a GUI to GitHub. If you want to make changes and improvements then please feel free! It’s only had a very little amount of work done on it so far so is pretty raw.